ผมทำโปรแกรมควบคุม หลอด LED ผ่าน Usb pararelprot คัยพอมีความรู้ทางนี้แนะนำหน่อยคับ

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;

namespace Application2
{
    public partial class Form1 : Form
    {
        private StreamWriter swSender;
        private StreamReader srReceiver;
        private TcpClient tcpServer;
        private delegate void UpdateLogCallback(string strMessage);
        private delegate void CloseConnectionCallback(string strReason);
        private Thread thrMessaging;
        private IPAddress ipAddr;
        private bool Connected;
        int stand = 888;
        Boolean swith = false;
        int lastValue;

        public class PortAccess
        {
            [DllImport("inpout32.dll", EntryPoint = "Out32")]
            public static extern void Output(int adress, int value);
        }

        private void setLED(int iValue, Label lable)
        {
            if (lastValue != iValue) { swith = false; }
            reset();
            if(swith ==false){                
                lable.BackColor = Color.RoyalBlue;
                SendMessage(iValue);
                swith = true;
            }else{                
                lable.BackColor = Color.White ;
                SendMessage(0);
                swith = false;
            }
            lastValue = iValue;
        }

        private void reset()
        {
            label1.BackColor = Color.White;
            label2.BackColor = Color.White;
            label3.BackColor = Color.White;
            label4.BackColor = Color.White;
            label5.BackColor = Color.White;
            label6.BackColor = Color.White;
            label7.BackColor = Color.White;
            label8.BackColor = Color.White;
        }

        public Form1()
        {
            InitializeComponent();
        }

        private void button10_Click(object sender, EventArgs e)
        {
            PortAccess.Output(stand, 0);
            reset();            
            Environment.Exit(0);
        }

        private void InitializeConnection()
        {
            ipAddr = IPAddress.Parse("192.168.1.11");
            tcpServer = new TcpClient();
            tcpServer.Connect(ipAddr, 1986);

            Connected = true;

            swSender = new StreamWriter(tcpServer.GetStream());
            swSender.WriteLine("Start");
            swSender.Flush();

            thrMessaging = new Thread(new ThreadStart(ReceiveMessages));
            thrMessaging.Start();
        }

        private void ReceiveMessages()
        {
            srReceiver = new StreamReader(tcpServer.GetStream());
            string ConResponse = srReceiver.ReadLine();
            if (ConResponse[0] == '1')
            {
                //this.Invoke(new UpdateLogCallback(this.UpdateLog), new object[] { "Connected Successfully!" });
            }
            else
            {
                string Reason = "Not Connected: ";
                Reason += ConResponse.Substring(2, ConResponse.Length - 2);
                this.Invoke(new CloseConnectionCallback(this.CloseConnection), new object[] { Reason });
                return;
            }
            while (Connected)
            {
                //this.Invoke(new UpdateLogCallback(this.UpdateLog), new object[] { srReceiver.ReadLine() });
            }
        }

        private void CloseConnection(string Reason)
        {
            Connected = false;
            swSender.Close();
            srReceiver.Close();
            tcpServer.Close();
        }

        private void SendMessage(int msg)
        {
            swSender.WriteLine(msg);
            swSender.Flush();
        }

        public void OnApplicationExit(object sender, EventArgs e)
        {            
            reset();
            if (Connected == true)
            {
                Connected = false;
                swSender.Close();
                srReceiver.Close();
                tcpServer.Close();
            }            
        }
        
        private void Form1_Load(object sender, EventArgs e)
        {
            InitializeConnection();
        }

        private void Form1_Closed(object sender, EventArgs e)
        {
            Environment.Exit(0);
        }

        private void button9_Click(object sender, EventArgs e)
        {
            SendMessage(0);
            reset();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            setLED(1, label1);
        }